High power factor, voltage-doubler rectifier
First Claim
1. A high power factor voltage-doubler rectifier for providing a dc output voltage, comprising:
- a rectifier including two pairs of series-connected diodes in a full-bridge configuration for providing a rectified ac voltage when coupled to an ac power line, said rectifier having a cathode and an anode;
dc-to-dc converter means coupled between said dc output voltage and a common potential, said dc-to-dc converter means having first and second output boost circuits inductively coupled thereto, said first output boost circuit being coupled in series between the cathode of said rectifier and said dc output voltage, and said second output boost circuit being coupled in series, with a polarity opposite to that of said first output boost circuit, between the anode of said rectifier and said common potential;
a pair of filter capacitors connected in series with a junction therebetween, the series combination of said filter capacitors being coupled between said dc output voltage and said common potential; and
switch means coupled between the junction joining the diodes of one of said two pairs and the junction joining said filter capacitors, said switch means being closed to enable operation in a voltage-doubling mode for relatively low input ac line voltages, and said switch means being open to enable operation in a low boost mode for relatively high input ac line voltages, said output dc voltage being maintained in substantially the same range in both said modes of operation.
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Accused Products
Abstract
A voltage-doubler rectifier includes an ac fullbridge diode rectifier and a dc-to-dc converter having two output boost circuits. One of the output boost circuits is coupled between the rectifier and a dc link, and the other output boost circuit is coupled, with opposite polarity, between the rectifier and the circuit common. Two series-connected filter capacitors are also coupled between the dc link and the circuit common. In a preferred embodiment, the two output boost circuits each comprise either a series, parallel, or combination series/parallel resonant circuit and a rectifier. A switch is coupled between the junction joining one pair of diodes of the rectifier and the junction joining the two filter capacitors. For a relatively high ac line voltage, the switch is open, and the circuit operates in a low boost mode. For a relatively low ac line voltage, the switch is closed, and the circuit operates in a high boost, or voltage-doubling, mode.
106 Citations
7 Claims
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1. A high power factor voltage-doubler rectifier for providing a dc output voltage, comprising:
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a rectifier including two pairs of series-connected diodes in a full-bridge configuration for providing a rectified ac voltage when coupled to an ac power line, said rectifier having a cathode and an anode; dc-to-dc converter means coupled between said dc output voltage and a common potential, said dc-to-dc converter means having first and second output boost circuits inductively coupled thereto, said first output boost circuit being coupled in series between the cathode of said rectifier and said dc output voltage, and said second output boost circuit being coupled in series, with a polarity opposite to that of said first output boost circuit, between the anode of said rectifier and said common potential; a pair of filter capacitors connected in series with a junction therebetween, the series combination of said filter capacitors being coupled between said dc output voltage and said common potential; and switch means coupled between the junction joining the diodes of one of said two pairs and the junction joining said filter capacitors, said switch means being closed to enable operation in a voltage-doubling mode for relatively low input ac line voltages, and said switch means being open to enable operation in a low boost mode for relatively high input ac line voltages, said output dc voltage being maintained in substantially the same range in both said modes of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification